@article{VMUMM_1991_6_a7,
     author = {I. N. Sergeev},
     title = {On minimal exponents of a triangular system and of the system of its diagonal approximation},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {42--44},
     publisher = {mathdoc},
     number = {6},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1991_6_a7/}
}